玉米穗长和穗粗的主基因-多基因混合遗传模型分析

Genetic analysis on ear length and ear diameter using mixed major gene plue polygenes inheritance model in maize

以PH6WC/7873(组合I)和MX002/MS001(组合Ⅱ)的6个世代P1、P2、F1、B1、B2、F2为材料,利用植物数量性状主基因+多基因混合遗传模型,研究玉米穗长和穗粗的主基因+多基因遗传规律。结果表明,两个组合穗长的遗传都符合加性-显性-上位性多基因遗传模型。组合I的穗粗符合加性-显性-上位性多基因遗传模型,组合Ⅱ的穗粗符合1对加性主基因+加性-显性多基因遗传模型。组合I穗长的多基因3个分离世代的多基因遗传率分别为47.5%、51.1%和61.9%。组合Ⅱ穗长的多基因3个分离世代的多基因遗传率分别为64%、66%和56%。组合I穗粗3个分离世代的多基因遗传率分别为57%、63%和67%。组合Ⅱ穗粗3个分离世代的主基因遗传率分别为2.5%、2.1%和47.4%,多基因遗传率分别为39.9%、45.1%和8.0%。

PH6WC/7873 （crosses I）and MXO02/MS001 （crosses 11 ）were employed to establish six genealgoicak populations （P1 ,P2, F1 ,B1 ,B2 and F2）. The ear length and ear diameter of maize were analyzed by means of classic genetics and the majorgene ＋ ploygene mixed inheritance model of quantitative traits. The results of analysis indicated that both of the ear length were controlled by suitable dominanee-epistasis polygenes. The ear diameter of crosses I was controlled by additive-dominanee-epistasis polygenes. The ear diameter of crosses 1[ was controlled by one additive mayjor gene and additive-dominance polygenes. The three segregating generations polygenes＇ heritability of the ear length in crosses I were 47.5%, 51.1%, 61.9%. The three segregating generations polygenes＇ heritability of the ear length in crosses 1I were 64%, 66%, 56%. The three segregating generations polygenes heritability of the ear diameter crosses I were 57%, 63%, 67%. The three segregating generations polygenes heritability of the ear diameter crosses 11 were 2.5%, 2.1%, 47.4%. The heritability polygenes were 39.9%, 45.1%, 8.0%.